掌深弓由________和__________构成。
参考答案：桡动脉的终支 尺动脉的掌深支
The operation is _____ success and the patient is now out of _____ danger.
A．a, the
B．a, /
C．/, the
D．/，/
______叫聚变．由于聚变必须在极高的温度和压强下进行，所以也叫______．
