皮肤瘙痒症多发季节为()
A.春季
B.夏季
C.秋季
D.冬季
E.夏、秋季
参考答案:D
China is ___ the east of Asia while Japan is ___ the east of China.
A.in, on
B.on, to
C.in, to
D.to, on
发生溢流、抢装箭型止回阀接方钻杆关井后,立压不为零,说明了什么问题?