旅客乘机的自尊需要主要表现为期望别人尊重他的人格。
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对于凸轮式刮板流量计,当有()对刮板时,在转子圆筒壁上沿径向开有互成60°角的6个槽。
A. (A)2
B. (B)3
C. (C)4
D. (D)5
采集样品时,在敌百虫吸收管前串一个内装硝酸银-硝酸溶液的吸收管,可除去()的干扰。
A. 敌敌畏
B. 空气中及颗粒物中的氯化氢
C. 三氯乙醛
What advantage does integrated messaging have over standard voice-mail systems?()
A. provides text versions of your voice-mail messages
B. forwards voice-mail messages to your email at .wav files
C. provides a toolbar to see the status of coworkers
D. eliminates the need for a live operator to answer the phone