怎样才算"高效、低毒、低残留"农药？

A. 外国驻华使馆、领事馆和国际组织驻华机构及其外交人员自用的车辆
B. 中国人民解放军的车辆
C. 设有固定装置的非运输车辆
D. 挖掘机、推土机

A. 正确
B. 错误

A. 刮板链出槽
B. 链板机上有矸石
C. 飘链
D. 链板机上有水

A. Because data does not need to arrive intact, so data transfer rates can be variable
Because lost voice-data packets must be retransmitted
C. Because voice data packets should arrive quickly and sequentially, and with no lost data
D. Because voice data packets must follow a single dedicated path through the network