在如图所示稳压管电路中,UZ1=UZ2=7V,正向导通时UD=0.7V,该电路的输出电压为()V。
A.1.4
B.7
C.10
D.14
参考答案:D
There was a football match last night. ______ people went to watch it.
A.Thousand
B.Three thousands
C.Thousands of
D.Thousand of
引起苦杏仁中毒的毒性物质是()
A.毒蛋白
B.毒氨基酸
C.生物碱
D.氰苷
E.毒肽类