[单项选择]He ______ with Smith at least four times in the past three years.
A. has been seen to meet
B. was seen to meet
C. had been seen meeting
D. is seen meeting

[简答题]

某液压泵输出油压力为10×10⁶Pa，转速为1450r/min，排量为100ml/r，泵的容积效率η_v=0.95，总效率η=0.9，求泵的输出功率和电机的驱动功率。

[单项选择]

在室温为20℃，大气压为1×10⁵Pa时，采集空气样品体积为20.0L，换算成标准状况下的采样体积是（）

A. 20.0L
B. 18.4L
C. 18.9L
D. 21.2L
E. 21.7L

[简答题]

有一液压泵，其空载时的排量V=10mL/r，在输出压力p=5×10⁶Pa，转速n=1200r/min时，输出流量为11.5L/min，求这台泵在这个压力下的容积效率η_V

[单项选择]He had studied hard, he would have been able to pass the exam.（　）
A. He had studied harder
B. If only he studied more
C. Had he studied harder
D. When he studied more

[简答题]I met him several times only learn he was a bad guy.

[填空题]Mr. Bascomb was upset. At times like this he wished he had never
become a candidate for mayor. Everything had gone wrongly that morning. (1) ______
Even though before leaving the house, he had received a telephone call from (2) ______
his election campaign manager asking money. This made him angry and he (3) ______
left the house in bad mood. When Mr. Bascomb arrived at the office, he could (4) ______
feel his head swinging. He reached out the medicine but the bottle was (5) ______
empty. He had forgotten picking up some medicine at the drug store. Mr. (6) ______
Bascomb looked at his watch. He Was to deliver a campaign speech before a
group of businessmen at the club at 11 o’clock. He had given a rough draft of
his speech to Barbara a day before and asked her to type it out for him. Just (7) ______
then, the telephone rang. It was Barbara. She explained that her car had
broken up and she couldn’t be at work until 12 o’ clock.