三相全控桥整流,当某一功率柜的快熔有两个熔断时,其输出值将降至原来的一半。
参考答案:错
—I think Shanghai food is______ Sichuan food.
—I don’t agree. I like Sichuan food better. [ ]
A. as well as
B. so good as
C. better than
D. more than
下图是处于平衡状态的简单淡水生态系统,请回答:
此生态系统中的分解者是()
A.水鸟
B.水绵
C.水藻
D.腐生细菌、真菌