装载压缩气体的车辆停放有何规定?

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问题:

装载压缩气体的车辆停放有何规定?

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It was ________ of my secretary not to have let others disturb me this morning when I was occupied with my work.
A.generous
B.polite
C.considerate
D.sympathetic
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简述运动负荷试验的基本原理。

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The problem is my weight. I’m just 1.57 meters high, but51. ______
my weight is 75 kilos. Many students often make a fun 52. ______
of me. Some boys were unfriendly for me—they call 53. ______
me "meat ball". That makes me to feel unhappy. 54. ______
Although I’m a bit too fat, yet I feel very well. I 55. ______
enjoy my meal. I love eating meat very much. And I like 56. ______
sweet food, though. I often have sugar with tea, milk. In57. ______
the past two months I had put on 5 kilos. So I’m becoming58. ______
more and more worried this problem, but I don’t 59. ______
know to lose weight quickly. Could you help me, dear doctor. 60. ______

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调车手信号中昼间为展开的红色信号旗,夜间为红色灯光是()。

A、停车信号

B、注意信号

C、运行信号

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已知直线x-y-1=0与抛物线y=ax2相切,则a=()

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