第10题: [多项选择]拖拉机直接牵引放线应遵守下列规定() A. 途经的桥梁、涵洞应事先进行检查与鉴定,不得冒险强行 B. 行驶速度不得过快,驾驶员应随时注意指挥信号 C. 行驶中作业人员不得爬车、跳车或检修部件 D. 挂钩上不得站人 E. 爬坡时拖拉机后面不得有人 F. 不得沿沟边、横坡等险要地形行驶 参考答案:A,B,C,D,E
第30题: [单项选择]Questions 11 to 18 are based on, the conversation you have just heard. A. He enjoys writing home every week. B. He never fails to write home once a week now. C. He doesn’t write home once a week now. D. He has been asked to write home every week. 参考答案:C 答案解析:[听力原文] W: How often do you write home You’ve bought so many stamps and there is only one of them
第31题: [单项选择]人体血浆中低密度脂蛋白的来源是 A. 肝分泌 B. 高密度脂蛋白转化而来 C. 由乳糜微粒或极低密度脂蛋白转化而来 D. 由甘油三酯和胆固醇转变而来 E. 肠分泌 参考答案:C 答案解析:[解析] LDL由VLDL转化而来,它是转运肝合成的内源性TC的主要形式。