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【单选题】
5-12．V 带传动设计中，限制小带轮的最小直径主要是为了_______。A.
使结构 紧 凑
B.
限制弯 曲 应力
C.
限制小 带 轮上的
D.
保证带和带轮接触面间有足够摩擦力
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【单选题】Don’t miss this ____ . It may never come again.
A.
opportunity
B.
skill
C.
book
D.
talking
【简答题】(B) Make sure you don’t miss Australia’s largest and most exciting kite-flying festival this year, which promises to be a great day out for the whole family. The skies will come alive with hundreds of...
【简答题】enthusiasm congratulate anniversary amazing proud pretend opportunity be admitted to jump for joy promotion success 7. Don’t miss this _____________, it may never come again.
【单选题】下列有关生物安全柜的实验操作中，不正确的是（）
A.
手臂应缓慢移动，避免影响正常的气流
B.
尽量避免将离心机、漩涡振荡器等仪器安装在柜内
C.
柜内尽量不要使用明火
D.
处理不同标本时，因柜内有垂直洁净气流，故不用担心标本之间相互污染
E.
在柜内摆放物品时，应尽量呈一字横向摆开
【单选题】下列有关生物安全柜的实验操作中，不正确的是（ ）
A.
手臂应缓慢移动，避免影响正常的气流
B.
尽量避免将离心机、旋涡振荡器等仪器安装在柜内
C.
柜内尽量不要使用明火
D.
处理不同标本时，因柜内有垂直洁净气流，故不用担心标本之间相互污染
E.
在柜内摆放物品时，应尽量放在安全柜的中后部
【单选题】Our teacher _________ a report this afternoon. Don’t miss it.
A.
gives
B.
was given
C.
is giving
D.
has given
【单选题】Mother gave Alice 30 dollars. She spends a fifth of the 30 dollars on books, a quarter of the remainder at a hairdresser's and buys a new skirt for 10 dollars. How many dollars does she have now? ()
A.
15
B.
8
C.
16
D.
9
【单选题】----How many new words are there in ________ lesson? ----There are only _________.
A.
five; fifth
B.
fifth; five
C.
the fifth; the five
D.
the fifth; five
【简答题】The home has an attached 2-car garage with a shop area. Central A/C & a high efficiency heating unit will keep the home cool in the summer & warm in the winter. Home is located minutes to Dallas City...
【简答题】排序。 ( ) How many kites can you see? ( ) Look at my new kite. ( ) I can see 16. ( ) How nice!
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