发病已5日的急性胰腺炎，对诊断有帮助的检查是( )
A．血清正铁血白蛋白B．血钙C．血清脂肪酶D．血清淀粉酶E．尿淀粉酶
参考答案：C
There are three basic ways of _____ language to writing, and all known graphic systems use one or a combination of these.
A．committing
B．attaching
C．comparing
D．relating
属于花色素的是（）
A.
B.
C.
D.
E.
