减小导热热阻的有效方法是（）。
A.减小导热系数，减小壁厚
B.增大导热系数，减小壁厚
C.减小导热系数，增大壁厚
D.增大导热系数，增大壁厚
参考答案：B
—Does your brother serve in the army?
—No, not now. But he _____ in the army for 8 years.[ ]
A. would serve
B. was serving
C. had served
D. served
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