甲硝唑具有（）。
A.抗立克次体作用
B.抗螺旋体作用
C.抗支原体作用
D.抗厌氧菌作用
参考答案：D
抛物线x2=ay的准线方程是y=2，则a=______．
In the past, we often a mooncake several parts to enjoy it. [ ]
A. separated; from
B. divided; into
C. cuts: into
D. divided; from
