单项选择题

下列反应中，氮元素被还原的是（）

A.2NO
B.N2+O2→2NO
C．2NO2→N2O4
D．3Mg+N2—→Mg3N2

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单项选择题

适用于危重病人的肠内营养支持的投给方式是（）

A.分次投给
B．连续滴注
C．间歇重力滴注
D．以上都不对

5-30 (g) Examine sales invoices for the last five sales transactions recorded in the sales journal in 2019 and examine shipping documents to determine they are recorded in the correct period.

答案： To examine sales invoices and shipping documents for the las...