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完形填空 A boy and a girl catch a bird and 1 it in a birdcage. They like it very much and 2 it every day. A cat sees the bird and wants 3 her supper. 4 the bird is in the cage. She can’t catch it. So she is very angry. One day, she opens the door of the cage 5 wants to catch it. But the bird flies away. The cat 6 , and she has 7 . The two children 8 and see the bird isn’t in. They are very angry and put the cat into the cage. (     )1. A. take (     )2. A. see (     )3. A. have it for (     )4. A. But (     )5. A. but (     )6. A. can to fly (     )7. A. no ways (     )8. A. come back to home B. put B. look B. has it for B. And B. and B. can fly B. some ways B. come back home C. carry C. have a look C. to have it for C. So C. so C. can't to fly C. any way C. come to home D. bring D. have a look at D. to has it so D. Then D. or D. can't fly D. not way D. back home
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【单选题】与防病毒卡相比,防病毒软件的优点之一是?
A.
成本高
B.
不便于升级
C.
便于升级
D.
速度快
【单选题】水平气压梯度是个矢量,在平直等压线分布的气压场中其方向为:
A.
垂直等压线由低压指向高压
B.
斜穿等低压线由高压指向低
C.
斜穿等压线由高压指向低压
D.
垂直等压线由高压指向低压
【单选题】与防病毒卡相比,防病毒软件的优点之一是_________。
A.
便于升级
B.
不便于升级
C.
成本高
D.
速度快
【判断题】在人的各种素质中,思想政治素质是最重要的素质。
A.
正确
B.
错误
【多选题】夹紧力作用点的选择原则是( )
A.
尽量作用在不加工表面上
B.
尽量靠近加工表面
C.
尽量靠近支承面的几何中心
D.
尽量作用在工件刚性好的地方
【单选题】Windows XP 桌面上, 17 是用户不可以删除的图标。
A.
我的电脑
B.
我的文档
C.
网上邻居
D.
回收站
【简答题】夹紧力作用点的选择原则?
【简答题】在图所示行星轮系中,已知各轮的齿数为z 1 =20,z 2 =30,z' 2 =15,z 3 =65,模数均为m=2mm,压力角α=20°。加在系杆H上的阻力矩M H =5N·m。求应加在齿轮1上的平衡力偶矩M b 及运动副B的反力R 2H 。
【单选题】With ______ exceptions, the former president does not appear in public now.
A.
rare
B.
unusual
C.
extraordinary
D.
unique
【多选题】夹紧力作用点的选择原则是()
A.
尽量远离加工面
B.
尽量靠近加工面
C.
尽量落在定位元件的支撑区内
D.
尽量作用在工件刚性大处
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