在生态系统中,任何一种生物的数量的消长,都会对其他生物产生影响。[ ]
√
–Jack is ill in hospital.
--Really ? I __________ him right now.
A.will visit
B.am going to visit
C.am to visit
D.am about to visit
在剧烈震动或对铝有腐蚀的场所及有爆炸危险的场所宜采用()电线电缆。
A、铜芯
B、铝芯
C、钢芯铜镀
D、钢芯铝镀