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【单选题】
直齿圆柱齿轮传动中,齿面受法Fn、径Fr和圆周力(切)Ft,在轮齿啮合的每一点得到以上三个力的大小和方向,但其中只有( )在各啮合点为一不变的常量。A.
法向力Fn
B.
径向力Fr
C.
径向力Fr
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举一反三
【单选题】Could you tell me _______, please? [ ]
A.
that he has been to Beijing twice
B.
what will they talk at tomorrow’s meeting
C.
where they would meet at the gate of the park
D.
something about tomorrow’s weather
【简答题】What will they talk about ?
【单选题】They don’t want anyone to know what they will talk about, so the conversation will be held strictly _________.
A.
in person
B.
in advance
C.
in privacy
D.
in public
【单选题】What will they talk about next week?
A.
The work plan
B.
The meeting place.
C.
The meeting time.
【单选题】What will happen?
A.
John will be away.
B.
The woman will go out.
C.
They will have a talk.
【简答题】What will they talk about? They will talk about the________ of the toy robot 02.
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