常用的海洛因使用方式中，效率最高但最危险的使用方式是：
A、口服
B、鼻吸
C、烫吸
D、肌肉注射
E、静脉注射

单项选择题杨氏模量实验中，下面说法不正确的是A. 逐差法处理数据，数据必须是偶数个B. 钢丝伸长量转化为尺子读数改变量的测量C. 钢丝原长的测量对杨氏模量影响最大D. 有的钢丝弯曲，可预加几个砝码使其伸直

单项选择题One of the contributions of Andrea Guarneri is that he passed on his artistry to young luthiers, he was one of the first to take apprentices from outside his family into his workshop. Antonio Stradivari could be his pupil also according to a label he wrote. A、正确 B、错误