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【简答题】
Mr. Read works in an office. He is very busy and has no time to have a good rest. Every evening, when he comes back from his office, he’s always tired and wants to go to bed early. But his wife often has a lot of interesting things to tell him after supper. She doesn’t stop talking until she 1.________________________, but it’s usually too late and Mr. Read has to get up in time in the morning. One day the man felt terrible and couldn’t go to work. He decided to 2. ____________________. Mrs. Read went with him. The doctor wrote out a prescription and said to Mrs. Read, “The bottle of medicine is for your husband and the pills are for you.” “For me?’ the woman said in surprise. “I’m fine. I don’t need any medicine!” “3. ______________________, madam,” said the doctor. “They are sleeping pills. Your husband will soon be all right if you take them.”
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【判断题】电流互感器二次回路中铜芯导线截面积应不小于2.5mm2。
A.
正确
B.
错误
【简答题】一个带有铁芯的螺线管称为 。
【单选题】根据化学变化的实质是旧化学键断裂、新化学键形成这一观点,下列不属于化学变化的是(  )
A.
P 2 O 5 溶于水
B.
O 2 转变成O 3
C.
加热NH 4 HCO 3
D.
NaCl溶于水
【判断题】公差带是由极限偏差所确定的一个允许变动的区域。
A.
正确
B.
错误
【简答题】肋拱桥是由两条或多条分离的(),以及在拱肋上设置的()和横梁支承的()组成。
【判断题】电流互感器二次回路中铜芯导线截面积应不小于5平方毫米。( )
A.
正确
B.
错误
【多选题】根据化学反应的实质是旧键断裂新键形成这一事实,下列变化不属于化学变化的是 [     ]
A.
白磷在260℃时转化为红磷
B.
HCl气体溶于水
C.
NaCl熔化
D.
P 2 O 5 吸水
【单选题】从化学键的观点看,化学反应的实质是“旧键的断裂,新键的形成”,据此你认为下列变化属于化学变化的是(  ) ①对空气进行降温加压 ②金刚石变成石墨 ③NaCl熔化 ④碘溶于CCl 4 中 ⑤HCl溶于水电离出H + 和Cl - ⑥电解熔融的Al 2 O 3 制取Al
A.
②③⑤
B.
②⑤⑥
C.
②⑥
D.
②③⑤⑥
【单选题】下列触发器,没有约束条件的是( )
A.
基本 RS 触发器
B.
同步 RS 触发器
C.
主从型 RS 触发器
D.
边沿 JK 触发器
【判断题】公差带是由极限偏差所确定的一个允许变动的区域
A.
正确
B.
错误
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