论语中有句“父母唯其疾之忧”是对()的解释。
A、忠
B、仁
C、孝
D、义
参考答案:C
Bacteria do not develop at low temperature, so that food can be _______ in cold storage.
A.deserved
B.reserved
C.preserved
D.conserved
机房那三地合一的作用是什么?