绘制组合体时一般以最能反映组合体形态特征方向的视图为主视图。
查看答案
组合体的组合方式可分为（）。
A. 叠加型
B. 切割型
C. 组合型
Listen to the report about air quality.
A. It's a result of human impact on the environment.
B. It is a result of a rain storm.
C. It's a result of a naturally occurring event.
D. Because it damages the human lung.
Listentothetalkaboutjunkfood.
A. Highlevelsoftrans-fats.
B. Asurplusofunneededcalories.
C. Properamountsofmacronutrientsandmicronutrients.
D. Largeamountsofaddedsugar.
Listen to the report about walking.
A. Better balance and coordination.
Boosting mood.
C. Improved muscle and bone strength.
D. Raises blood pressure
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