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【单选题】
铬是人体必需的微量元素，但过量的摄人可致损害，下列哪项描述是错误的（ ）。
A.
6价铬的毒性比3价铬的毒性要小l00倍
B.
铬具有强烈的刺激性和腐蚀性
C.
铬具有明显的致突变作用
D.
铬具有很强的致癌作用
E.
6价铬的毒性比3价铬的毒性要大l00倍
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参考答案：
举一反三
【单选题】Helen asked me _____ the film called “ Star War.”
A.
have I see
B.
had I seen
C.
whether I have seen
D.
if I had seen
查看完整题目与答案
【判断题】混凝土强度越高，钢筋混凝土轴心受拉构件的承载力也越高。
A.
正确
B.
错误
查看完整题目与答案
【判断题】采用左手投格时，用左手托住快件的右上角，左臂拖住快件的左下角，或左手拖住快件左下角，拇指捻件，右手投入并用中指轻弹入格。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Helen asked me the film called "Star War."
A.
have I seen
B.
had I seen
C.
whether i have seen
D.
if  I had seen
查看完整题目与答案
【单选题】Helen asked me ____ the film called"Ster War."
A.
have I seen
B.
had I seen
C.
whether I have seen
D.
if I had seen
查看完整题目与答案
【判断题】Helen asked me have I seen the film.
A.
正确
B.
错误
查看完整题目与答案
【判断题】采用左手投格时，用左手托住快件的右上角，左臂拖住快件的左下角，或左手拖住快件左下角，拇指捻件，右手投入并用中指轻弹入格。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Helen asked me _________ the film called “ Star War. ”
A.
have I seen
B.
had I seen
C.
C . whether I have seen
D.
D . if I had seen
查看完整题目与答案
【单选题】Helen asked me the film called "Star War".
A.
have I seen
B.
had I seen
C.
whether I have seen
D.
if I had seen
查看完整题目与答案
【单选题】Helen asked me_________the film called "Star War".
A.
have I seen
B.
had I seen
C.
whether I have seen
D.
if I bad seen
查看完整题目与答案
相关题目：
【单选题】Helen asked me _____ the film called “ Star War.”
A.
have I see
B.
had I seen
C.
whether I have seen
D.
if I had seen
查看完整题目与答案
【判断题】混凝土强度越高，钢筋混凝土轴心受拉构件的承载力也越高。
A.
正确
B.
错误
查看完整题目与答案
【判断题】采用左手投格时，用左手托住快件的右上角，左臂拖住快件的左下角，或左手拖住快件左下角，拇指捻件，右手投入并用中指轻弹入格。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Helen asked me the film called "Star War."
A.
have I seen
B.
had I seen
C.
whether i have seen
D.
if  I had seen
查看完整题目与答案
【单选题】Helen asked me ____ the film called"Ster War."
A.
have I seen
B.
had I seen
C.
whether I have seen
D.
if I had seen
查看完整题目与答案
【判断题】Helen asked me have I seen the film.
A.
正确
B.
错误
查看完整题目与答案
【判断题】采用左手投格时，用左手托住快件的右上角，左臂拖住快件的左下角，或左手拖住快件左下角，拇指捻件，右手投入并用中指轻弹入格。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Helen asked me _________ the film called “ Star War. ”
A.
have I seen
B.
had I seen
C.
C . whether I have seen
D.
D . if I had seen
查看完整题目与答案
【单选题】Helen asked me the film called "Star War".
A.
have I seen
B.
had I seen
C.
whether I have seen
D.
if I had seen
查看完整题目与答案
【单选题】Helen asked me_________the film called "Star War".
A.
have I seen
B.
had I seen
C.
whether I have seen
D.
if I bad seen
查看完整题目与答案
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