下列是微量高速离心法测定血细胞比容的特点，但除外
A．用血量少
B．测定时间短
C．效率高
D．血浆无残留
E．精度好
参考答案：D
____ the TV play, he got down to ____ his homework.
A．Watching; do
B．After his watching; do
C．Watched; doing
D．Having watched; doing
H01-6型焊炬可用于焊接（）厚的钢板。
A、1～6mm
B、10～60mm
C、0.1～0.6mm
D、100～600mm
