合同价款的支付一般分三次，设备制造前采购方支付设备价格的( )作为预付款。
A．5% B．10% C．15% D．20%
参考答案：B
Single-parent usually____ some of the functions that absent adult in the house would have served under the financial crisis.
A．takes over
B．takes after
C．takes out
D．takes in
延迟焦化工艺有哪些最新的进展？
