广州的气温比北京高,其主要影响因素是[ ]
A、纬度因素
B、海陆因素
C、地形因素
D、洋流因素
答案:A
What would have happened ______as far as the river bank ?[ ]
A. Bob had walked farther
B. if Bob should walk farther
C. had Bob walked farther
D. if Bob walked farther
卧式壳管式冷凝器端盖内设有(),以便冷却水循环。