___, he failed to pass the test.
A. Hard although he tried.
B. He tried hard, though
C. Hard as he tried.
D. Though hard as he tried
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____,the fire men were unable to quench the fire.
A. Try they would.
B. As they tried
C. What they tried.
D. Try as they would
Angiosperms inhabit relatively diverse environments and may be found___higher plants can survive
A. there.
B. where.
C. somewhere.
D. then
对于绝大多数液体,随着温度的升高,其热导率()。
A. 不变
B. 升高
C. 降低
D. 不确定
对于通过某一平壁的一维定态热传导过程,如果材料导热系数随温度升高按线性规律上升,则平壁内温度在热流方向上的分布规律是()。
A. 抛物线下降
B. 直线下降
C. 抛物线上升
D. 直线上升