问题
单项选择题
先导式安全阀阀盖上通大气孔漏气的原因是（）。
A.膜片密封不严
B.密封严密
C.接头脱落
D.阀腔内有压力
答案
参考答案：A
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先导式安全阀阀盖上通大气孔漏气的原因是（）。
A.膜片密封不严
B.密封严密
C.接头脱落
D.阀腔内有压力
参考答案：A
| 完形填空。 | |||
| A man was walking along the street when he saw a woman struggle (奋力) with a large box. It was half in and half __1__ of her car. He was a helpful kind of man, so he went up to the woman and said, "Let me give you a hand with that box. It looks very __2__ ." "That's very kind of you," the woman said. "I'm having a lot of __3__ with it. I think it's stuck (卡 住). " "Together we'll soon move it," the man said. He __4__ into the back seat of the car and took hold of the other end of the box. He said, "I'm ready. " And he began to __5__ hard. For several minutes the man and the woman struggled with the box. Soon they were __6__ in the face. "Let's rest for a minute," the man said. "I'm sorry, but it __7__ stuck. " A few minutes later, the man said, "Let's try again. Are you ready?" __8__ of them took hold of the box again. "One, two. three! " the man said, and they went on with their struggle. At last, when they were very tired, the man said, "You are__9__ . It really is stuck. I don't think there's __10__ we can get it out of the car. " "Get it out of the car!" The woman cried. "I'm trying to get it in!" | |||
| B. out B. strong B. questions B. stepped B. carry B. tired B. falls B. All B. right B. anywhere | C. on C. dear C. matter C. came C. push C. red C. grows C. Either C. clever C. any one | D. off D. new D. accidents D. walked D. lift D. hurt D. seems D. Both D. sure D. any way |