低镁血症的诊断标准为：

A．血清镁低于0.5mmol/L

B．血清镁低于0.7mmol/L

C．血清镁低于0.8mmol/L

D．血清镁低于0.9mmol/L

E．血清镁低于0.95mmol/L

The worn-out bags are all second-hand ones（）stated in the shipping order.

A.so

B.as

C.that

D.like