The basic American handshake______.
A．can be done with either the right hand or the left hand
B．is complicated and difficult to follow
C．is often done by people at an old age
D．can be done between old or new friends
多个样本均数之间的两两比较需用哪种方法
A.t检验
B.t＇检验
C.方差分析
D.正态性检验
E.q检验
下列说法错误的是()。
A.当烤烟烟叶成熟度达到成熟时,烟叶内的糖、氮、碱含量适中,且相互间比例谐调
B.当烤烟烟叶成熟度达到尚熟时,烟叶内的糖、氮、碱含量适中,且相互间比例谐调
C.当烤烟烟叶糖、氮、碱含量最高时,且相互间比例谐调
D.当烤烟烟叶生长发育充分,烟叶内的糖、氮、碱含量适中,且相互间比例谐调
此题为多项选择题。请帮忙给出正确答案和分析，谢谢！
When shopping online, make sure______.
A．you have installed the secured browser in the computer
B．you can see the secure lock displayed by your browser
C．you are alone when making the online purchase
D．you have entered the correct credit card number
预防破伤风用
A、丙种球蛋白
B、类毒素或抗毒素
C、活疫苗
D、化学药品
E、灭活疫苗
During the medieval times, if one man covered in armor extended an open hand to another, ______.
A．the same gesture would definitely be returned
B．he was sending a signal of friendship
C．he would receive a dagger or sword
D．he was asking for a weapon