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听力原文：I've called this meeting because, as you're all probably aware, we have some security issues in this building. There have been a number of thefts and reports of unauthorized persons wandering around the premises. So, we have some new guidelines to deal with this. Some of these are just common sense so, to begin with, can I ask you all to close any windows before you leave the building at night? From next month, all the office space will be air-conditioned and the windows will be sealed, so this will cease to be a problem. Next, the new I. D. swipe-card system will be in place from Monday, so if you haven't collected your card from Jenny, please do so before you go. What is the purpose of the meeting?A.
To report thefts
B.
To help unauthorized persons around the premises
C.
To explain new security measures
D.
To make a collection for Jenny who is leaving
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【简答题】在图示曲柄滑杆机构中，曲柄以等角速度ω绕O轴转动，开始时，曲柄OA水平向右。已知：曲柄的质量为m 1 ，滑块A的质量为m 2 ，滑杆的质量为m 3 ，曲柄的质心在OA的中点，OA＝l；滑杆的质心在点C, 求：(1)机构质量中心的运动方程；(2)作用在轴O的最大水平约束力。
【简答题】Take two of these tablets three times a day after meals. 译成:
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【简答题】three times a day 译成:
【单选题】”这药片一天吃三次。”译成英语是____。
A.
Please take the pills a day three times.
B.
Please take the pills three times a day.
C.
Please take the pills three time a day.
【单选题】关于输尿管哪项是正确的( )
A.
输尿管长约20cm
B.
最细部分内径为2~3mm
C.
输尿管在腹膜后
D.
在子宫动脉的前方交叉
E.
有骶髂关节处经髂内动脉起点前方入盆腔
【单选题】在曲柄滑块机构中,若曲柄的角速度为 ω 1 (顺时针),用瞬心法表示出从动件3的移动速度为 。
A.
v 3 = ω 1 l AB
B.
v 3 = ω 1 l BC
C.
v 3 = ω 1 l AD
D.
v 3 = ω 1 l CD
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