属于糖异生的酶是
A．6-磷酸葡萄糖脱氢酶B．苹果酸脱氢酶C．丙酮酸脱氢酶D．葡萄糖-6-磷酸酶
参考答案：D
I _______ spend the Saturday afternoon with my old friends in the zoo, but they did not come.
A．was going
B．was to
C．will
D．was about to
抽头式弧焊机的电流调节方式是无级的。( )
