题目内容

She had returned, unknown to me, ______ the previous afternoon.

A. by
B. on
C. at
D. in

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The factory has been ______ black smoke from its chimneys.

A. giving out
B. emitting
C. sending
D. spreading

某企业每天最高耗用500公斤A材料,收到A材料的最高间隔时间为10天,该企业的再订货点是()

A. 5000公斤
B. 500公斤
C. 50公斤
D. 0公斤

在评价水对钢筋混凝土结构中钢筋的腐蚀性时,按

A. Cl-含量与SO2-4含量之和
B. Cl-含量与S02-4含量折算值之和
C. 不计S02-4含量
D. Cl含量折算值与SO2-4含量折算值之和

If you work hard______, you won’t have to sit up all night before the exam.

A.with some help
B.willingly
C.at other times
D.by yourself

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