对高速重载的齿轮传动，如飞机、汽车和机床制造中的重要齿轮，齿_爱下问搜题

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问题单项选择题

对高速重载的齿轮传动，如飞机、汽车和机床制造中的重要齿轮，齿轮传动精度等级应选择（）。

A、6级

B、7级

C、8级

D、9级

答案

参考答案：A

完形填空

完形填空。

Mike and I 1___________ good friends. 2___________ Sunday we are in 3___________ room. His room is
very clean and tidy. There 4___________ two windows in his room. Near the window there is 5___________
desk. On the desk 6___________ is a lamp 7___________ some books. 8___________ the desk there is a bed.
On the 9___________ there is a picture 10___________ Mike's family.

( ) 1. A. am
( ) 2. A. On
( ) 3. A. Mike
( ) 4. A. is
( ) 5. A. a
( ) 6. A. there's
( ) 7. A. and
( ) 8. A. Near
( ) 9. A. window
( ) 10. A. of

B. is
B. In
B. Mike's
B. are
B. an
B. their
B. or
B. In
B. bed
B. for

C. are
C. To
C. Mikes
C. be
C. two
C. there
C. with
C. On
C. wall
C. to

单项选择题

患儿，2岁，因智力低下，不能行走来就诊。查体：头大，目光呆滞，面色苍黄，身长68cm，体重9kg，前囟未闭，腹胀，有脐疝，此患儿确诊应做下列哪项检查（）

A.血清T3、T4测定

B.甲状腺吸碘率测定

C.骨骼X线摄片

D.甲状腺V显像

E.血清T4、TSH测定