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如何要设置表格居于屏幕中央,需为table的CSS样式规则添加什么声明?
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【单选题】According to the author, there is a trend______.
A.
for people to travel more during hard times
B.
for younger people to delay working by traveling first
C.
for travelers to spend less
D.
for younger travelers to be unrealistic as they travel
【单选题】I stayed in Japan only a few matches, , I went through a series of hardship.
A.
during when
B.
at that time
C.
during which time
D.
of which time
【单选题】Houses in Ica experienced terrible destruction during the E1 Nino event because _____.
A.
tile El Nino event was the strongest
B.
it seldom rained there
C.
the houses couldn't stand the flood
D.
E1 Nino was unexpected
【简答题】潜在储氢材料－化合物A是第二周期两种氢化物间通过配位键形成的化合物，是乙烷的等电子体，相对分子质量30.87，常温下为白色晶体，稳定而无毒。刚刚融化的A 缓慢释放氢气，转变为化合物B（乙烯的等电子体）。B不稳定，易聚合成聚合物C（聚乙烯的等电子体）。C在155℃释放氢气转变为X（聚乙炔的等电子体），其中聚合度为3的化合物D是苯的等电子体。高于500℃时 D释放氢气，转变为化合物E，E有多种晶型，有...
【简答题】用以增加疗效的作用
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