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【简答题】
两个均质圆轮A和B,质量均为m,半径均为r,用细绳连接如图所示,轮A绕固定轴O转动。细绳的质量和轴承摩擦不计。B下落时两个轮子的角加速度、B心C的加速度以及绳的张力。
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【单选题】After recovering from his illness, he was advised to __________ gardening as a hobby.
A.
take up
B.
take off
C.
take down
D.
take away
【单选题】Community service can ___________ anything from gardening to helping in old people’s homes.
A.
involve
B.
ask
C.
insist
D.
remain
【单选题】Linda learned about square -foot gardening ______.
A.
by attending a class
B.
from her parents
C.
through a gardening magazine
D.
by learning form. her friend
【单选题】After ________ from his illness, Mr.Smith was advised to take up gardening as a hobby. [ ]
A.
benefiting
B.
recovering
C.
suffering
D.
separating
【单选题】在用YT-1226压力调节器中，若压力的下限值调定为0.5MPa，现要求上限值0.68MPa，其幅差弹簧应设定的格数为（ ）。
A.
5格
B.
6格
C.
7格
D.
8格
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