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【单选题】
下列各对元素中,属于类金属元素的是()。A.
Na和K
B.
Ca和Mg
C.
B和Si
D.
Cu和Au
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皮皮学刷刷变学霸
举一反三
【单选题】The UN member states ______ positively and quickly after the quake rocked Haiti.
A.
reflected
B.
replied
C.
rejected
D.
responded
【单选题】Haiti is at risk for a big earthquake because
A.
Haiti is part of Hispaniola which has a fault line.
B.
there is a fault line that runs along the southern side of Haiti.
C.
there is a fault line along the western side of Haiti.
D.
Haiti is located in the Western Hemisphere.
【多选题】以下说法错误的是________。
A.
空隙率是指材料内孔隙率体积占总体积的比例
B.
空隙率的大小反映了散粒材料的颗粒互相填充的致密程度
C.
空隙率的大小直接反映了材料内部的致密程度
D.
孔隙率是指材料内孔隙体积占总体积的比例
【简答题】管道连接常用的填压材料有哪些?
【多选题】以下说法错误的是( )。
A.
空隙率是指材料内孔隙体积占总体积的比例
B.
空隙率的大小反映了散粒材料的颗粒互相填充的致密程度
C.
空隙率的大小直接反映了材料内部的致密程度
D.
孔隙率是指材料内孔隙体积占总体积的比例
【单选题】With aid across the world, the brave Haiti people are sure to _____ the problems caused by the mass earthquake. [ ]
A.
break down
B.
get off
C.
break off
D.
get over
【单选题】Apart from the shortage of water and food, the survivors in Haiti are _______the terrible plague (瘟疫). [ ]
A.
in search of
B.
in charge of
C.
at the mercy of
D.
as a result of
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