问题 问答题 简答题

螺杆式制冷压缩机开机前的准备有哪些?

答案

参考答案:

开机前要检查螺杆压缩机各个部分;

转子应转动灵活,无障碍物;

油位高度达到油面线即油镜中间位置偏上;

冷凝器和油冷却器的水路应畅通;

排气阀应开启滑阀应处在0%的位置以便卸载启动。

并观察高低压情况,如压力不平衡,则要开启旁通阀,使高低压平衡。然后关阀门。

阅读理解

This tour takes you back in history to a moment that “will live in infamy (声名狼藉). ” Explore the historic artifacts at the Arizona Memorial Visitor Center commemorating(纪念) the attack on Pearl Harbor, then travel around beautiful Oahu on a Circle Island guided bus tour.

The Arizona Memorial Visitor Center is Hawaii’s number one visitor attraction. View the film of the attack on Pearl Harbor and browse the historic artifacts on display. Then ride the Navy launch across Pearl Harbor to visit the Arizona Memorial. Then, board a tour bus for a scenic trip around the island of Oahu. Get your cameras ready for the beautiful view over Windward Oahu at Nu’uanu Pali Lookout. Visit Byodo-In Temple, which is set against a picturesque mountain backdrop.

You’ll also see the famous North Shore surfing beaches of Sunset, Banzai Pipeline, and Waimea Bay and drive through rustic Haleiwa Town. Visit Dole Plantation and discover the history of Hawaii’s pineapple industry before enjoying a no host lunch at the Polynesian Cultural Center (lunch is not included in the listed-price).

Inclusions:   Scenic bus tour of Oahu island

Film viewing at Arizona Memorial Visitor Center. Pearl Harbor

Visit of Byodo-In Temple and Dole Plantation

Available:

Mon. —Fri.

Hours of operation:

7 AM to 5 PM

Note:

Strict security measures forbid purses, handbags, fanny packs, backpacks, camera bags, diaper bags, luggage and/or other items. Visitors may bring a camera and cam-recorder. A storage facility, operated by a private vendor, is available for visitors coming to the USS Arizona Memorial, USS Bowfin Submarine Museum & Park, the Battleship Missouri and the Pacific Aviation Museum.

49. What is the purpose of the passage above?

A. To introduce the beautiful scene in Oahu.   B. To tell the writer attractions in Hawaii.

C. To attract more tourists.                        D. To describe a wonderful tour in Oahu.

50. Which of the following is the right order of the tour?

A. The Arizona Memorial, Byodo-In Temple, Nu’uanu Pali Lookout, Polynesian Cultural Center

B. Pearl Habor, Dole Plantation, Nu’uanu Pali Lookout, Sunset Beach

C. Pearl Habor, North Shore, Byodo-In Temple, Dole Plantation

D. The Arizona Memorial, Nu’uanu Pali Lookout, Dole Plantation, Polynesian Cultural Center

51. A tourist will see everything below at Pearl Harbor except _______.

A. the Arizona Memorial       B. some historic artifacts  C. a film  D. Windward Oahu

52. Which of the persons below will not be allowed to enter the attractions in Pearl Harbor?

A. Alice, a student from LA, comes with her parents, with a Sony digital camera in her hand.

B. Geogre Zhang, from Shanghai, leaves his backpack in a locker outside the entrance.

C. Billy, from Italy, with small bag in hand and inside the bag is a cam-recorder.

D. Hose, from Spain, who has left his luggage in the hotel.

单项选择题