【判断题】任何一个化学反应都可以用来判断其反应进行的方向
【单选题】This car is of good quality . If it _____ break down within 2 years, we would repair it for free. [ ]
【单选题】盐城市区支付宝共享单车几乎遍布了每个小区,极大方便了市民的出行.自行车上为了减小摩擦的地方是
【单选题】We shall go ______ we are free.
【简答题】It’ not free. We charge $ 30 for ______________________.
【判断题】矿井井下轨道中道床应经常清理,应无杂物、无浮煤、无积水。()