问题
判断题
根据原油的成分,可把原油分成蜡基、沥青基和混合基三大类。
答案
参考答案:对
根据原油的成分,可把原油分成蜡基、沥青基和混合基三大类。
参考答案:对
用方框中所给单词的适当形式填空。 | |
2. John is very ______________. He has big arms and long legs. 3. Look at _____________ black shoes over there. 4. I have two _____________ in my hand. 5. The man _____________ young in that blue shirt. |