DMD的发病是由负责下述哪种蛋白合成的基因异常所致（）
A.葡萄糖-6-磷酸酶
B.己糖胺酶B
C.肌球蛋白
D.抗肌萎缩蛋白
E.肌动蛋白
参考答案：D
Each Class A EPIRB shall be stowed in a manner which will permit（）.
A.easy access to its storage compartment
B.replacement of the battery without exposure to the weather
C.it to float free if the vessel sinks
D.it to remain attached to the vessel
1岁以内婴儿总能量约需每日每公斤体重（）
A.80kcal
B.90kcal
C.100kcal
D.110kcal
E.120kcal
