维果斯基的发展理论有哪些基本观点？这些观点对当前基础教育课程改革有何启发作用？
查看答案
ZD6系列电动转辙机自动开闭器的动接点打入静接点后，用手扳动接点，其（）不大于3mm。
依法应缴纳车船税的车辆是（）。
A. 消防专用车
B. 石油储运专用车
C. 交警巡逻专用车
D. 法院执法专用车
Which statement concerning current is TRUE（）.
A. Current can be determined by measuring the direction and distance between simultaneous EP and DR positions
B. The drift of the current should be averaged out on a one hour basis
C. After the current is determined，it should not be used for further plotting because it is an unknown variable
D. The distance between a simultaneous DR position and fix is equal to the drift of the current
微信支付 
支付宝支付