善于治疗砂淋、石淋的药物是()
A.车前子
B.茯苓
C.滑石
D.金钱草
E.薏苡仁
参考答案:D
核电荷数为1~18的x、y两元素,x元素原子的次外层电子数与最外层电子数的差等于5;y元素比x元素的原子多4个电子,则y与x可能形成的化合物是( )
A.xy
B.xy2
C.xy3
D.x2y
It can not be a(n) ___that four jewellery stores were robbed in one night.
A.coincidence
B.accident
C.incident
D.chance