被称为"七绝圣手"和"梅妻鹤子"的诗人分别是()
A、王昌龄林逋
B、杜甫陶渊明
C、王昌龄陶渊明
D、杜甫林逋
参考答案:A
I was doing some shopping in the supermarket______ it suddenly occurred to me that I'd left my
wallet at home.[ ]
A. when
B. while
C. until
D. before
造成螺杆式制冷压缩机制冷能力不足的原因是()。
A.滑阀不在正确位置
B.油压不高
C.吸入过热气体
D.内部泄漏