金属材料的伸长率和断面收缩率的值越大,表示金属材料()。
A、弹性越好
B、塑性越好
C、弹性越差
D、塑性越差
参考答案:B
根据语境,选择要说的话,将其标号填入题前括号内。
1.当你在商场购物时,售货员会说:[ ]
A. What can I do for you?
B. Can you help me?
C. Could you give me a hand, please?
2.当你打电话,问对方是谁时,说:[ ]
A. Who's that, please?
B. Who are you?
C. Who are you looking for?
3.当你邀请别人参加你的生日聚会时,说:[ ]
A. When and where shall we meet?
B. Would you like to come to my birthday party?
C. When can I have my birthday party?
4.当你建议某人出去与你散步时说:[ ]
A. Why don't you come out for a walk with me?
B. Come and have dinner with me.
C. Walk after supper is good for your healthy.
5.当你发现Tom不舒服时,问: [ ]
A. What are you doing, Tom?
B. What do you do, Tom?
C. What's the matter with you, Tom?
以下是叶子姐姐做的几个验证性小实验,其中不会发生的现象是( )
A.研究平面镜成像的特点时,将玻璃板后的蜡烛换成光屏,发现光屏上不能承接到像
B.在玻璃片上滴上两滴酒精,将其中一滴摊开,发现摊开的那滴酒精先不见了
C.将长度和粗细都相同的铜丝和电炉丝串联,通电一段时间后,发现铜丝更热
D.向两张纸片之间吹气,发现两张纸片互相靠近