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【简答题】
往复式内燃机按照完成一个工作循环所需的行程数可分为( )。 A.单行程和多行程发动机 B.四行程和二行程发动机 C.四冲程和单行程发动机B.四行程和二行程发动机 D. 000
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【单选题】John has caught a bad cold. _______
A.
It’s too bad
B.
I don’t mention it
C.
I’m sorry to hear that
D.
Take it easy
【简答题】图示回路，溢流阀的调整压力为5MPa，顺序阀的调整压力为3MPa，问下列情况时A、B点的压力各为多少？ 液压缸活塞杆伸出时，负载压力P L =1MPa时；
【单选题】Faced with a bill for $10, 000, __________.
A.
John has taken an extra job
B.
the boss has given john an extra job
C.
an extra job has been taken
D.
an extra job has been given to John
【单选题】With his hard work, John ____ the basic knowledge of computer.A. has caught B. has acquired C. has required D. has acknowledged
A.
has caught
B.
has acquired
C.
has required
D.
has acknowledged
【单选题】John caught a cold on Saturday and ______ in bed ever since. [ ]
A.
was
B.
has been
C.
is
D.
have been
【简答题】John has never been on time, ______? A) has John B) hasn't John C) has he D) hasn't he
【单选题】Little John caught a (n)______fish this morning.
A.
alive
B.
alone
C.
lonely
D.
living
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