clung with a cold was a joke to his friends, because it ______

第1题

刚体作平面运动时，以A为基点的角速度w_A和角加速度e_A，若以B为基点的角速度为w_B和角加速度e_B，则下列关系正确的是()。

A.w_A≠w_B

B.w_A=w_B

C.e_A≠e_B

D.e_A=e_B

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第2题

When the judge returned to the courtroom ,everyone immediately_______up.A. stoodB. wa

A.A. stood

B.B. was standing

C.C. stands

D.D. had stood

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第3题

“你从什么地方来啊”中的“啊”应念()。

A.wa哇

B.na哪

C.ya呀

D.nga啊

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第4题

The watch that is within this parcel was purchased on November 2, 2000, and is （) wa

The watch that is within this parcel was purchased on November 2, 2000, and is () warranty.

A、under

B、within

C、in

D、at

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第5题

“快来看啊”中的“啊”应念（)

A.wa哇

B.na哪

C.ya呀

D.nga啊

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第6题

Colin_______ the bass guitarist since Brian left.A. has beenB. isC. has been beingD. wa

A.A. has been

B.B. is

C.C. has been being

D.D. was

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第7题

锚重与链重的关系，一般为Wa=60Wc×10－3，则每只锚的重量约等于________锚链的重量。

A.50m

B.60m

C.70m

D.80m

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第8题

Why do you think they had not a backup computer？A．Because it was easy down.B．Because it wa

Why do you think they had not a backup computer？

A．Because it was easy down.

B．Because it was very expensive.

C．Because it was not advanced enough.

D．Because it was not as big as the main computer.

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第9题

－I've never heard of it. Is it any good？－________.A.That sounds great. Let's wa

-I've never heard of it. Is it any good？

-________.

A.That sounds great. Let's watch something else.

B.It's supposed to be.

C.Really？ I've heard it's not that great.

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第10题

图示片簧长l=50mm，工作载荷P=6N，要求在P力作用下自由端产生挠度wA=2mm。材料为锡青铜，[σ]=150MPa，E=115×103M

图示片簧长l=50mm，工作载荷P=6N，要求在P力作用下自由端产生挠度w_A=2mm。材料为锡青铜，[σ]=150MPa，E=115×10³MPa。试设计此片簧的尺寸b及h。

关键提示：由同时满足刚度与强度两个条件定出b、h。

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