保证金开立的账户类型为（）。
A.保证金账户
B.凭证账户
C.追加账户
D.合同账户
参考答案：B, C, D
Having finished her project ,she was invited by the school______ to the new students.
A．speaking
B．having spoken
C．to speak
D．to have spoken
用手捞提法鉴别润滑油粘度时，形成油流直径越大，下淋速度越慢，油滴越大，则油的粘度（）。
A、越大
B、越小
