不含药材原粉的制剂，每克含细菌数不得超过
A．10000个
B．5000个
C．1000个
D．500个
E．100个
参考答案：C
The bridge _________two years ago. [ ]
A.is built
B. built
C. were built
D. was built
玉米丝黑穗病病菌在杂草上越冬，成为翌年初侵染源。
