应用()调节流量是比较经济的,因为它没有附加的能量损失。
A.切割叶轮外径
B.节流
C.改变转速
D.旁路
参考答案:C
阅读理解,判断正(√)误(×)。
Ann had a dream last night. She was an astronaut. Ken was in her dream. He was an astronaut, too. They
were in the spaceship. Then they in space. There were many stars and planets. Mars was very cold. There
was no water. There was no air. There were no trees. but there were martians. They were afraid but the
martians were friendly. Soon they were friends. They had fun on mars. She had a good dream.
( ) 1. Ken had a dream last night.
( ) 2. Ann had a dream last night.
( ) 3. There were many stars and planets in the space.
( ) 4. Mars was very hot.
( ) 5. The martians were friendly.
( ) 6. Ann had a bad dream.
19世纪末康梁维新派救亡图存思想的核心是()
A.以中国伦常名教为原本,辅以诸国富强之术
B.设议院、兴民权、实行君主立宪
C.由君主专制变为民主共和是“进化之公理”
D.今日之民智……待革命以开之