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【单选题】
关于饺链四杆机构,下列说法不正确的是( )。A.
最短杆为机架时,一定为双曲柄机构
B.
连杆最短时,一定为双摇杆机构
C.
曲柄摇杆机构中最短杆一定为摇杆
D.
连架杆最短时,一定为曲柄摇杆机构
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举一反三
【单选题】Which word best describes Professor Hall's relationship with his students?
A.
Controversial.
B.
Impersonal.
C.
Patronizing.
D.
Cooperative.
【单选题】Professor Virginia ______to give a lecture in our school hall yesterday.
A.
invites
B.
will be invited
C.
was invited
D.
is invited
【单选题】听力原文：W: When will Professor Hall come back? M: Professor Hall plans to stay in London for another week after the conference. What does the man mean about Professor Hall?
A.
He won't come back until the end of the conference.
B.
He will come back this week.
C.
He will stay in London for another week.
【单选题】---Where did you find the professor who made the speech yesterday? --- It was in the hall ____ the students often have a meeting.
A.
Where
B.
which
C.
that
D.
when
【单选题】假设郑州市被确定为甲类传染病疫区并进行封锁,根据《传染病防治法》规定,封锁这个疫区必须由下列哪个主体决定?(郑州市是河南省省会,国家交通干线)
A.
国务院
B.
国家卫生计生委
C.
国家疾控中心
D.
河南省政府
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