肾上腺素主要用于
A．神经性休克B．轻症支气管哮喘C．心源性休克D．房室传导阻滞E．过敏性休克
参考答案：E
When teaching the mother of a 17-month-old about toilet training, which instruction would initially be most appropriate（）
A. Place the toddler on the potty chair every 2 hours for t0 minutes.
B. Offer a reward every time the child has a bowel movement in the potty chair.
C. Remove the diaper and use training pants to begin the process.
D. Be sure the child is ready before starting to toilet train.
根据《劳动合同法》第十九条的规定，同一用人单位与同一劳动者（）。
A.可以约定两次试用期
B.最多约定两次试用期
C.只能约定一次试用期
D.可以协商约定试用期次数
