This _____ a desk. These _____ chairs. [ ]
A. is; are
B. are; is
C. is; can
D. can; is
答案:A
柱塞泵实际流量与理论流量的比值一般在()之间。
A、O.80-0.95
B、O.80-0.90
C、O.75-0.85
D、O.75-0.90
RAMBUS内存槽有()只引脚
A.72
B.2.5
C.184
D.192