机组奔油是一种常见故障，它与（）有着直接关系。
A.吸气压力升高
B.热负荷减小
C.制冷剂多少
D.蒸发器结霜
参考答案：B
---What was Jim wearing at the party?
--- Nothing _______. He was in his usual shirt and jeans.
A．special
B．simple
C．important
D．interesting
糖尿病因末梢神经炎、下肢动脉供血不足及细菌感染可引起()
A．大骨节病
B．四肢麻木
C．糖尿病足
D．扁平足
E．O形腿
