小明同学利用圆珠笔杆、钢丝、细绳制成了如图所示的滑轮组用其匀_爱下问搜题

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问题选择题

小明同学利用圆珠笔杆、钢丝、细绳制成了如图所示的滑轮组用其匀速提升重物，不考虑摩擦、笔杆和绳重，下列说法正确的是（　　）

A．拉细绳的力F等于钩码重力G的

B．拉细绳的力F等于钩码重力G的

C．拉细绳的力F等于钩码重力G的

D．拉细绳下降的距离是钩码上升高度的

答案

答案：C

完形填空

完形填空。

My name is Lily. 1 is my birthday. My aunt 2 uncle 3 me a big cake. 4 the table, you can 5 my lovely cake. You can also 6 my name on it. Thereare other 7 for my birthday. They 8 apples and bananas. My friends Jim andKim are 9 .I will eat those foods 10 my friends.

( ) 1. A. That
( ) 2. A. or
( ) 3. A. find
( ) 4. A. Behind
( ) 5. A. see
( ) 6. A. got
( ) 7. A. things
( ) 8. A. am
( ) 9. A. come
( ) 10. A. of

B. This
B. and
B. give
B. On
B. saw
B. look
B. thing
B. is
B. comeing
B. from

C. Today
C. with
C. want
C. In
C. to see
C. see
C. anything
C. are
C. coming
C. with

单项选择题 A1型题

近年来脓胸最常见的致病菌是（）

A.肺炎链球菌

B.金黄色葡萄球菌

C.溶血性链球菌

D.结核菌

E.真菌