额定功率1W的100Ω电阻,两端允许所加最大直流电压为()。
A.1V;
B.10V;
C.50V;
D.100V。
参考答案:B
She showed the visitors around the museum, the construction ________ had taken more than three years.[ ]
A. for which
B. with which
C. of which
D. to which
“神奈川试验”可用于鉴定()
A、蜡样芽孢杆菌
B、沙门氏菌
C、副溶血性弧菌
D、变形杆菌
E、葡萄球菌肠毒素