在常用的不定型密封材料中，( )具有良好的粘结性能、弹性和低

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问题单项选择题

在常用的不定型密封材料中，( )具有良好的粘结性能、弹性和低温柔性，无溶剂污染，无毒，具有优异的耐候性。

A．沥青嵌缝油膏
B．丙烯酸类密封膏
C．聚氯乙烯接缝膏和塑料油膏
D．硅酮密封膏

答案

参考答案：B

补全对话，情景问答

补全对话。根据对话内容，在空格中填写一个句子，使对话完整、正确。

A. Do you think I can pass the PE test?

B. 1______. You've been exercising for quite a long time.

A. Yes, but I'm still worrying about that.

B. 2______. You can succeed this time.

A. 3______. You know, besides exercising every day. I also eat on diet.

It's possible that I've lost some weight.

B. Yes, 4______. people are likely to lose weight when they exercise more and eat less.

A. All right. 5______. Bye-bye.

B. Bye-bye. Good luck.

单项选择题

《学记》说：“道而弗牵，强而弗抑，开而弗达”，这与以下哪一原则的精神符合（）

A．直观性原则

B．启发性原则

C．巩固性原则

D．循序渐进原则