球形伸缩器的优点是()。
A.占地面积小,节省材料,不存在推力
B.制造方便,补偿能力大,轴向推力较大,维修方便,运行可靠
C.装置简单、可靠
D.安装简单,占地少
参考答案:A
Read and order. (读句子,排序,组成一个小短文)
( )1. On your chair?
( )2. It's OK.
( )3. Under the bed?
( )4. Where is my toy fox, mom?
( )5. No, it isn't, It's not on the chair.
( )6. Oh, yes. It's under the bed. Thanks, mom.
抗中性粒细胞抗体(ANCA)胞浆型阳性者对下列哪一种疾病的诊断有很高特异性
A.系统性红斑狼疮
B.显微镜下多动脉炎
C.干燥综合征
D.Wegener肉芽肿
E.多发性大动脉炎