【单选题】为了提高功率因数,某感性负载两端并联一个电容,则并联电容后该电路( )。
A.
总有功功率比原来降低,总的无功功率比原来提高。
B.
总有功功率比原来提高,总的无功功率比原来降低。
C.
总有功功率比原来一样,总的无功功率比原来降低。
D.
总有功功率比原来一样,总的无功功率比原来提高。
【多选题】可以用于抢救感染性休克的药物包括( )。
【简答题】在绳上传播的入射动方程 ,入射波在x=0处绳端反射,反射端为自由端,设反射波不衰减,则反射动方程(),形成驻动方程()。
【判断题】The Pauli exclusion principle is the quantummechanical principle which states that two or more identical fermions(particles with half-integer spin) can occupy the same quantum state within aquantum sy...
【简答题】17 (a) Briefly cite the main differences between ionic, covalent, and metallic bonding. (b) State the Pauli exclusion principle.
【单选题】The inverse demand function for cases of whiskey is defined by p = 160-6q and the inverse supply function is defined by p = 61 + 3q. Originally there was no tax on whiskey. Then the government began t...
【单选题】发生交通事故后,如有人员受伤,第一时间应抢救伤员。