机床特性代号中的“G”表示（）。
A、自动加工特性
B、高精度特性
C、高精密特性
D、自动换刀特性
参考答案：B
读一读，看一看，写一写。
I made a survey yesterday. My friend Amy had a bowl of _ 1 _ for breakfast. Zhang Hua had _ 2 _
_ 3 _ for breakfast. Mike had_ 4 _and an _ 5 _ for lunch. No one had _ 6 _ 7 _ 8 _
for dinner. But they all ate 9 _ and 10 _
体内氨的储存和运输形式是（）
A.谷氨酸
B.天冬氨酸
C.酪氨酸
D.天冬酰胺
E.谷氨酰胺
for dinner. But they all ate 9 _ 
and 10 _ 