对于100mL 1mol/L盐酸与锌粒的反应，下列措施能使反应速率加快的是[ ]

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问题选择题

①升高温度 ②改用100mL 3mol/L盐酸 ③改用300mL 1mol/L盐酸 ④用等量锌粉代替锌粒

A. ①③④

B. ①②④

C. ②③④

D. ①②③

答案

答案：B

连词成句

连词组句。

1. get, up, I, morning, the, in

__________________________.

2. like, don't, I, dumplings

__________________________.

3. is, favourite, your, what, food

__________________________?

4. you, do, eat, for, cereal, breakfast

__________________________?

5. time, it, is, supper, for

__________________________.

6. salt, French, fries, on, like, I

__________________________.

7. like, do, you, noodles

__________________________?

8. are, you, today, how

__________________________?

9. Tom, tall, .4, metres

__________________________.

10. her, is, hair, long

__________________________?

单项选择题

造成持续性枕后位的原因，不正确的是

A．漏斗型骨盆
B．单纯扁平骨盆
C．胎头俯屈不良
D．子宫收缩乏力
E．急产