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【简答题】
热力管道安装中,水平管道变径时应采用( )连接。
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举一反三
【单选题】计算机网络拓扑结构中,一旦中心节点崩溃则全网瘫痪的是
A.
环型
B.
网状型
C.
总线型
D.
星型
【单选题】水煤气在实际生产中有热量损失其中主要部分是吹出气带走的()以及其他热损失致使水煤气的气化效率只能达到50%~60%。
A.
物理热
B.
化学热
C.
显热
【判断题】设 与 复合而得到函数 .若 在点 可导, 对 具有连续偏导数, 则复合函数 在点 可导, 且 。( )
A.
正确
B.
错误
【判断题】出售中的宝贝数量连续 5 周为 0 件,店铺会彻底释放, 店铺会被删除。 系统会发送旺旺及邮件告诉您 “ 店铺已经彻底释放,任何人都可以申请并使用您的店铺名称 ” 。您需要登陆卖家中心操作激活店铺,按照提示完成指定操作,店铺就可重新开张。店铺激活后店铺信誉、装修、订购的服务等都不受影响。
A.
正确
B.
错误
【单选题】Since he became one of the accountants of PriceWaterhouse Coopers, Tom has to work day and night. Now, his hard work _____on his stomach.
A.
has taken its part
B.
has taken its effort
C.
has taken its toll
D.
has taken its role
【单选题】Since he became one of the doctors, Tom has to work day and night. Now, his hard work _____on his stomach.
A.
has taken its part
B.
has taken its effort
C.
has taken its role
D.
has taken its toll
【多选题】燃煤锅炉对大气有污染的主要燃烧产物是
A.
二氧化碳
B.
硫化物
C.
一氧化碳
D.
氮氧化物
【多选题】燃煤主要产生的大气污染物有()。
A.
二氧化硫
B.
烟尘
C.
氮氧化合物
D.
氧气
【单选题】Since he became one of the accountants ofPriceWaterhouse Coopers, Tom has to work day and night. Now, his hard work_____on his stomach.
A.
has taken its part
B.
has taken its effort
C.
has taken its role
D.
has taken its toll
【多选题】学生研究的特点包括
A.
题目可能是被强加的。
B.
必须在特定时间内完成。
C.
拥有足够的研究经费。
D.
结果必须以特定形式表达。
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