直接写出得数．12+12=411+25=34-12=15-34=_爱下问搜题

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问题解答题

直接写出得数．

1

2

+

1

2

=

4

11

+

2

5

=

3

4

-

1

2

=

15-

3

4

=

答案

1

2

+

1

2

=1

4

11

+

2

5

=

42

55

3

4

-

1

2

=

1

4

15-

3

4

=14

1

4

选择题

Most nurses are women,but in the higher ranks of the medical profession men are in the _____. [ ]

A. minority

B. majority

C. shortage

D. substitute

单项选择题

A级洁净区中，≥5μm动态悬浮粒子最大允许数为

A．1个/m3

B．2个/m3

C．3个/m3

D．4个／m3

E．5个／m3