煮沸消毒法是将洗刷干净的茶水具置于100℃沸水中煮（）分钟。 A

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问题单项选择题

煮沸消毒法是将洗刷干净的茶水具置于100℃沸水中煮（）分钟。

A.15—20

B.20—25

C.15—30

D.20—30

答案

参考答案：C

填空题

用所给单词的适当形式填空。

1. Look, the girls ______________ (sing) now.

2. Peter ______________ (want) ______________ (write) a letter to his friend.

3. Would you like ______________ (join) ______________ (we)?

4. There is a lot of ______________ (rain) here.

5. What ______________ (do) she usually do? She usually ______________ (catch) insects.

6. They ______________ (have) a picnic this weekend.

7. I like ______________ (swim) very much.

单项选择题

设计模具时与确定型腔数目无关的因素是（）。

A、现有设备的情况

B、塑件本身的尺寸

C、塑件的精度

D、塑件的原料