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【单选题】
滑块1置于水平面2 上,当滑块1上作用一个与竖直方向成a角的驱动力F时,如下哪种情况下将发生自锁? (摩擦角记为ψ)( )。A.
a
B.
a>ψ
C.
a< 90 ° +ψ
D.
a> 90 ° +ψ
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【简答题】口算： 3 2 +2 2 = 2.25+ 3 4 = 4 7 ÷4 = 8- 4 5 = 0.21× 3 4 +0.21÷4 = 21÷4= 1÷( 1 10 ÷ 1 8 ) = 1 5 ÷5×25 = 5 9 + 1 5 - 5 9 = 1- 11 13 - 2 13 =
【简答题】Section C Directions: In this section, you will hear three passages. At the end of each passage, you will hear three or four questions. Both the passage and the questions will be spoken only once. Aft...
【单选题】My grandfather is as ________ as a young man and hates sitting around doing nothing all day.
A.
nervous
B.
energetic
C.
anxious
D.
creative
【简答题】根据语境，填入适当的词语或句子，补全对话。 A: Hello, Mr Zhang! B: Hello, Bob! You look worried and nervous. _ 1 ? A: I have a big problem. _ 2 . B: What's your problem? A: You know I love basketball best. But since I...
【简答题】听下面一段材料，回答第1至第3题。 1. How did the man feel when he met the woman? [ ] A. Upset. B. Nervous. C. Surprised. 2. What is the man? [ ] A. He is an employee at the Internet Cafe. B. He is a student w...
【简答题】直接写出得数。 0.3×7= 0.66÷6= 10÷0.2= 0.25×4= + = - = 1- = + =
【简答题】竖式计算并验算 （1）3.906+0.66= （2）28.56-14.76=
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