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【单选题】
下列各式中,属于电离方程式的是 [     ]
A.
HCO 3 - +H 2 O H 2 CO 3 +OH -
B.
HCO 3 - +H 2 O CO 3 2- +H 3 O +
C.
HCO 3 - +OH - ==CO 3 2- +H 2 O
D.
HCO 3 - +H + ==CO 2 ↑+H 2 O
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举一反三
【单选题】We thought it was he who did it, but it _________ that he wasn’t even there.
A.
turned up
B.
turned down
C.
turned off
D.
turned out
【简答题】Practice 3-Part 1.doc Answer Sheet.doc
【简答题】unit 1 -Part 1 作业.doc
【单选题】Was it a he or a she(Paragraph 2) may be replaced by
A.
Who did it.
B.
Who was the person who wrote it.
C.
Did he or she write it.
D.
Was it written by a man or a women.
【简答题】Part 1 Details.doc
【多选题】1181下列说法错误的是:( ).
A.
托盘车属于平面搬运设备
B.
输送带属于高位搬运设备
C.
液压托盘车属于电动型设备
D.
笼车属于人力搬运设备
【简答题】Unit 3 Part 1 - 副本.doc
【判断题】玻璃清洁剂类似多功以清洁剂,能有效是去除污斑,使用后会在玻璃表面留下透明的保护膜,方便以后的清洁工作。 ( )
A.
正确
B.
错误
【单选题】磨砂玻璃或花纹玻璃在清洁时,要用柔软的干布擦拭,若有油污,使用 清洁。
A.
去污粉
B.
碱性清洁剂
C.
牙膏
D.
专用玻璃清洁剂
【简答题】常值系统误差