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【单选题】
下列控制系统中，属于开环控制系统的是A.
智能电冰箱的温度控制
B.
计算机的CPU上的风扇的转速控制
C.
现代化农业温室的温度控制
D.
红绿灯定时控制系统
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皮皮学刷刷变学霸
举一反三
【单选题】He left school after taking six O-levels because______.
A.
he was afraid that the market might disappear
B.
he did not enjoy school at all
C.
he wanted to work on computers
D.
he wanted to become a millionaire and retire early
【单选题】— He said he would arrive _____ six o’clock. But now it’s nearly seven. — Maybe he will arrive _____ a few minutes.
A.
at; in
B.
in; in
C.
after; after
D.
in; after
【单选题】---Where is George? He said he would meet me here at 3 o’clock. ---He seems ________ with Mr. Brown in the office.
A.
to talk
B.
to have talked
C.
to be talking
D.
to be talked
【单选题】–Could you tell me ? –At 8 o’clock.
A.
when will he get there
B.
when he will get there
C.
where he will go
D.
how will he go there
【简答题】Why did he leave school after taking six O-levels? Because he wanted to ______.
【单选题】How did Yao react to O'Neil's comment?
A.
He attacked O'Neil violently.
B.
He ridiculed O'Neil before the reporter.
C.
He faced it with a sense of humor.
D.
He avoided to answer the reporter's question.
【单选题】It was seven o;clock in the morning ____ he came back.It was really at seven o’clock ___ he came back from work this morning.
A.
that; that
B.
when;when
C.
when; that
D.
that;when
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