在[-1,1]上随机地取一个数k,则事件“直线y=kx与圆(x-5)2+y2=9相交”发生的概率为()。
参考答案:
Jane is ill. She ______ now. [ ]
A. is in a hospital
B. be in a hospital
C. be in hospital
D. is in hospital
人工挖孔桩的直径不宜小于800mm,桩底一般都不扩底。