当乘务人员不慎接触到泄漏的危险品时,以下哪项是错误的行为?() 迅速将污染的衣物脱掉。 将污染的衣物放在垃圾箱内。 用大量的水冲洗。 寻求医疗帮助。
在20℃时煤(包括煤的孔隙)的质量称之() 块密度。 真密度。 视密度。
要声明一个长度为256个字符的定长字符串变量str,下列语句正确的是() dim str as string。 dim str as string(256)。 dim str as string[256]。 dim str as string*256。
きのう的意思是()。 今日。 明日。 昨日。 今年。
When a marine surveyor is employed to assist in the move of a mobile offshore drilling unit,he(). becomes responsible for the safe movement of the rig。 relieves the Offshore Installation Manager at the moment the rig is free from the bottom。 must be designated as the person in charge of the rig。 is a specialist who is hired to provide advice and guidance on aspects of the move。
下列哪些原因使温带深水湖在春季出现生物生产力高峰:()