JF201电压调节器属于()电压调节器。
A.晶体管
B.电磁式
C.振动式
D.混合式
参考答案:A
右心衰竭的病人常因组织液生成过多而致下肢水肿,其主要原因是()
A.血浆胶体渗透压降低
B.毛细血管血压增高
C.组织液静水压降低
D.组织液胶体渗透压升高
E.淋巴回流受阻
Deck foam systems,designed to protect cargo areas on tankers built after January 1,1975,must have a supply of foam-producing material to operate the system at its designed rate of foam production for().
A.15 minutes without recharging
B.20 minutes without recharging
C.25 minutes without recharging
D.30 minutes without recharging