这个标志的含义是告示前方道路是单向通行路段。

Before the game started Alien's friends believed he was ___ but he didn't feel ___. Then after the first ten minutes, he began to take heart.

A．sure to win; sure to success

B．sure of success; sure of it

C．sure to win; sure about that

D．sure about winning; sure to win

银翘散和桑菊饮的组成药物中含有

A．连翘、杏仁、桔梗

B．银花、杏仁、桔梗

C．连翘、薄荷、芦根

D．银花、薄荷、芦根

E．杏仁、甘草、芦根，

正常情况下，液力变矩器每工作（）h，应进行分解、调整、检修。

A、600

B、1200

C、1800

D、2400

治疗甲氨蝶呤所致巨幼红细胞性贫血时，宜选用（）

A.口服叶酸

B.肌注叶酸

C.肌注亚叶酸钙

D.口服维生素B₁₂

E.肌注维生素B₁₂