【单选题】净料单位成本等于( )与加工后原料重量的比值
【单选题】影响小儿生长发育的因素中,下列哪项是错误的:
【判断题】( )光纤信道为OF-300等级,其光纤信道应支持的应用长度不应小于500m。
【单选题】净料单位成本等于()与加工后原料重量的比值。
【单选题】--- Can you spell your name, please? --- Yes, I _________.
【单选题】---Mr Wang, I have trouble ________ the text. ---I’m sure you can, but remember ________ it at least three times.
A.
to understand; reading
B.
understanding; reading
C.
to understand; to read
D.
understanding; to read