本安接地系统接地电阻一般场所为()欧
A.1
B.3
C.4
D.2
参考答案:C
Could _____ be in the restaurant _____ you lost your handbag? [ ]
A. it; which
B. it; that
C. that; that
D. that; where
可锻铸铁中,石墨的存在形式是()
A、粗大片状
B、团絮状
C、球状
D、蠕虫状