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My mother is a teacher work in a key high school. She is too busy that she often has to get up early and stay up late. In addition to this, she hardly has any times to take exercise. She has been on poor health for some time. My father and I are worried that she may fall itl if she works too hard. These days I’m thinking why to develop my mother’s interest in playing sports. Considered that today is Mother’s Day, I decided buy a pair of jogging shoes for her. I secret put them on the desk in her study. When my mother entered into her study this evening, she looked surprised, but she immediately realized my intention. She promises that she would go jogging every evening.
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【单选题】下面关于救生筏的说法哪些是错误的其构造应能经受在一切情况下暴露达30天
A.
救生筏的额定乘员最少为8人,也不能超过25人
B.
救生筏应能在18米高度抛掷下水而不影响使用
C.
能忍受从4.5米高度反复跳下而不致损坏
【单选题】救生筏应能在多少米高度抛掷下水而不受影响使用?
A.
15米
B.
18米
C.
20米
【简答题】保持匀速飞行时,阻力与推力A. 相等 B. 阻力大于推力 C. 阻力小于推力
【单选题】下面关于救生筏的说法哪些是错误的_____。
A.
其构造应能经受在一切情况下暴露达30天
B.
救生筏的额定乘员最少为8人,也不能超过25人
C.
救生筏应能在18米高度抛掷下水而不影响使用
【单选题】下列缺陷属于材料的本征缺陷的是()
A.
弗仑克尔缺陷
B.
肖特基缺陷
C.
杂质缺陷
D.
A+B
【单选题】保持匀速飞行时,阻力与推力
A.
相等
B.
阻力大于推力
C.
阻力小于推力
【单选题】救生筏应能在_________高度抛掷下水而不会影响使用。
A.
15米
B.
18米
C.
20米
D.
25米
【单选题】气胀式救生筏,应能在()高度抛掷下水而不影响使用。
A.
10米
B.
15米
C.
18米
D.
20米
【单选题】保持匀速飞行时,阻力与推力
A.
相等
B.
阻力大与推力
C.
阻力小与推力
【单选题】救生筏应能在多少米高度抛掷下水而不受影响使用?
A.
15米
B.
18米
C.
20米
D.
10米
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