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【多选题】
锋面的主要特征是_______。A.
锋区中垂直温度梯度大
B.
水平温度梯度大
C.
气流呈气旋性切变
D.
锋两侧气压梯度不连续
E.
气流呈反气旋性切变
F.
锋面向暖区倾斜
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皮皮学刷刷变学霸
举一反三
【单选题】—What did John say? —He told me that he_________ a cold for three days. [ ]
A.
has caught
B.
had caught
C.
has had
D.
had had
【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】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
【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 =4MPa时；
【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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