导管内 * * 状瘤时，常出现的 * * 溢液是
A．血性溢液B．黄色或黄绿色溢液C．浆液性无色溢液D．棕褐色溢液
参考答案：A
读一读，填一填。
One duck (鸭子) has a mouth (嘴), two eyes (眼睛), two legs (腿).
Two ducks have two mouths, four eyes, four legs.
Three ducks have three mouths, six eyes, six legs.
Four ducks have _____________ mouths, _____________ eyes, _____________ legs.
锯材防护剂透入度检测试样合格率应达到（）%。
A.60
B.70
C.80
D.90
