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下列说法中不正确的是 A．光导纤维和石英的主要成分都是二氧化硅 B．遗弃的废旧电池、塑料袋、废纸、破会造成水污染 C．苏丹红、谷氨酸钠（味精）、碳酸氢钠（小苏打）、亚硝酸钠、明矾等都是在食品加工或餐饮业中禁止使用或使用量要严加控制的物质 D．纳米装饰材料是一种不会产生甲醛、芳香烃及氡等会造成居室污染的绿色产品
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举一反三
【简答题】霍尔计数传感器如图所示,当钢球通过霍尔开关传感器时,传感器可输出毫伏脉冲电压,该电压经( )放大后,驱动三极管工作,三极管输出端接( )进行计数。
【简答题】It was a cold night. The taxi driver didn’t take even one passenger（乘客） all day. When he went by the railway station，he saw a young man coming out with two bags in his hands. So he drove to him and as...
【单选题】You didn’t take his advice. __ his advice, you _____ such a mistake.
A.
Had you taken; wouldn’t have made
B.
If you had taken; wouldn't make
C.
Were you lo take; shouldn’t have made
D.
Have you taken; won' t have made
【单选题】You didn’t take his advice, ______it, you ______such a mistake. A.If you had taken, would make B.Were you to take, shouldn’t have made C.Had you taken, wouldn’t have made D.Have you taken, won’t have ...
A.
B.
C.
D.
D
【简答题】阅读理解。 It was a cold night. The taxi driver didn’t take even one passenger all day. When he went by the railway station , he saw a young man coming out with two bags in his hands. So he drove to him an...
【单选题】三、完形填空 (本题10小题,每小题2分,共20分) 从 A、B、C、D四个选项中选出最佳答案 Many Chinese students find it difficult to learn English ,but not Chinese, because Chinese is their mother language.In fact Chinese is much more difficu...
A.
He
B.
She
C.
Her
D.
His
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