药材小茴香的主要成分是()
A.挥发油
B.甘油酯类
C.生物碱
D.有机酸
E.鞣质
参考答案:A
As we know, _____is good exercise and it is necessary for health.[ ]
A. walks
B. walking
C. walks
D. walked
FOB Under Tackle 是指卖方承担货物装入船舱、脱离吊钩为止的一切费用和风险。( )