超前锚杆支护宜采用缓凝砂浆作为锚杆支孔壁的胶结物,以适应围岩变形。( )
参考答案:错
I ______ English in that school since I came to the city. [ ]
A. have taught
B. am teaching
C. will teach
D. taught
深圳证券交易所规定,申购单位为( )股。
A.500
B.1000
C.100
D.5000