设θ是第三象限的角,且,则是().
A.第一象限角
B.第二象限角
C.第三象限角
D.第四象限角
参考答案:D
解析:
,又,故为第四象限角,选D。
She didn’t come to the party last Sunday.___,she must have made the party more exciting.
A.If she came
B.Would she come
C.Had she come
D.Did she come
患者男,60岁,诉咀嚼时牙齿过敏,查牙面磨耗重,叩(-),探敏,冷(-),不松,牙石(+),拟诊()。
A.浅龋
B.中龋
C.牙本质过敏
D.逆行性牙髓炎
E.变性牙髓炎