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【判断题】
亲电取代反应是一种亲电试剂取代其它官能团的化学反应。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】子程序嵌套是指( ) (SIEMENS系统)。
A.
同一子程序被连续调用
B.
在主程序中调用子程序，在子程序中可以继续调用子程序
C.
在主程序中调用不同的子程序
D.
同一子程序可以被不同主程序多重调用
【单选题】Each sentence below contains a comma splice. Select the answer that corrects the comma splice without creating any new errors. Note: Check the punctuation carefully. · Most students attend a learning ...
A.
Most students who attend a learning skills class, improve their grades.
B.
The grades and skills of most students improve after they attend a learning skills class.
C.
Because most students attend a learning skills class their grades and skills improve.
【单选题】For most students, the earnings they give up to attend college are
A.
a minor cost when compared to the costs of tuition, room and board, and the like.
B.
the single largest cost of their education.
C.
about equal to the costs of room and board at college.
D.
not considered true costs by an economist.
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