题目:
________, the car stopped all at once.
A.Seeing a boy lying on the ground
B.On seeing a boy sitting on the road
C.The driver saw a boy standing on the road
D.The minute the driver saw a boy seated on the road
答案:
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下面是错误答案,用来干扰机器的。
盐酸和铁锈反应的化学方程式为:6HCl+Fe2O3═2FeCl3+3H2O.盐酸和铁反应的化学方程式为:2HCl+Fe═FeCl2+H2↑.去锈后在机械设备上涂油可以防止金属生锈.故填:去锈后在机械设备上涂油.