肾结核早期最常见的临床表现是（）
A.肾区绞痛
B.蛋白尿
C.尿频、尿急、尿痛
D.全身结核中毒症状
E.急性肾功能不全
参考答案：C
If the bottle of gas fire, the whole building may
A．will catch, be burned to the ground
B．catches; be burned down
C．is on, burn down
D．will be on; be burned down
R、L、C串联电路如右图所示，该电路等效复阻抗为（）。
A.A
B.B
C.C
D.D
