由腓肠肌记录的胫神经的H反射潜伏期为（）
A.10～20ms
B.20～30ms
C.30～40ms
D.40～50ms
E.50～60ms
参考答案：C
Which of the following is included in non-cash adjustments to net income in the statement of cash flows（）
A. Prepaid items.
B. Credit sales.
C. Credit purchases.
凡属哪些气温下的混凝土施工，均应按低温季节混凝土施工的有关规定执行？
