HIV感染的细胞主要是()
A.神经胶质细胞
B.单核细胞
C.B淋巴细胞
D.CD4T+淋巴细胞
E.直肠黏膜上皮细胞
参考答案:D
She has _____ finished her lunch, but she hasn't washed her bowls ______. [ ]
A. already, yet
B. just, already
C. already, just
D. just, yet
若PLC输出端接直流电感性负载,则应在()
A、负载回路中串联续流二极管
B、负载回路中串联浪涌吸收器
C、负载的两端并联续流二极管
D、负载的两端并联浪涌吸收器