X6132型万能铣床的全部电动机都不能启动，可能是由于（）造成的。

A、停止按钮常闭触点短路

B、SQ7常开触点接触不良

C、控制变压器TC的输出电压不正常

D、电磁离合器YCI无直流电压

⑥We are considering providing each of our sales representatives with an eight-digit electronic calculator. Last week I saw a demonstration of your Model GH Wizard at the Boise Business Show, and I think it would fill our needs very nicely. I understand that the Wizard retails for＄33.95. Is there a trade discount for companies that buy in fairly large quantities? ⑦Our initial order would be for about 80 units and reorders in perhaps lots of 20.

文中⑦段画线部分翻译正确的是（）。

A.我们最先的订货是80台，然后再订20台之多。

B.我们预先订货80台，后续还会有几批每次20台的订货。

C.我们预先订货80台，然后还有很多新的20台。