取400粒小麦种子放在解剖盘内湿润的滤纸上，7天后有360粒种子萌发，则这些小麦种子的发芽率为（ ）
A．57%
B．90%
C．88%
D．94%
答案：B
China is developing fast. That's ________ I think those of my colleagues who deal with China affairs should visit China.
A．because
B．why
C．when
D．how
螺栓连接抗剪工作三个阶段的特点是什么？
