化学肥料的特点是养分含量高，以及（）等。
A、肥效慢
B、肥效快
C、养分均衡
D、含部分机质
参考答案：B
—How is he getting on with his spoken English?
—Great. Now he can speak English _____ his English teacher. [ ]
A. as good as
B. as better as
C. as many as
D. as well as
对于老化器件，以下故障率描述正确的是（）
A.故障率>8%
B.故障率>10%
C.故障率>9%
D.故障率>7%
