目前微生物的快速检测和自动化分析中，广泛的采用的免疫学技术是‏
‌‏
‌‏

静脉注射时针头与皮肤成 A、5°  B、15-30°  C、30-40° D、45-50° E、90°

单项选择题静脉注射时针头与皮肤成
A、5° 
B、15-30° 
C、30-40°
D、45-50°
E、90°

制作滤纸筒时要注意，其直径略大于抽提筒内径。A．错误 B．正确

不定项选择制作滤纸筒时要注意，其直径略大于抽提筒内径。

A $100,000 5-year 7% bond is issued on January 1, 20X0....

单项选择题 A $100,000 5-year 7% bond is issued on January 1, 20X0. The bond pays interest annually. The market rate is 6%. What is the selling price of the bonds, rounded to the nearest dollar?