嗜铬细胞瘤所具有的特征性表现为（）
A.持续性高血压
B.直立性高血压
C.阵发性高血压
D.高血压、低血压交替
E.低血压、休克
参考答案：C
Fill in the blanks and complete the dialogues. 填空，补全对话。
1. — books do you have?
—I have sixteen.
2. — is it?
—It's a chair.
3. — is it now?
—It's six o'clock.
4. — you fly?
—No, I can't.
5. — for one donut?
—One yuan.
工艺要求扭距为80-100Nm。检验合格范围应该是（）。
A.80-100Nm
B.80-110Nm
C.80-120Nm
D.70-120Nm
