盆腔淋巴分为髂淋巴组、腰淋巴组和骶前淋巴组。()
参考答案：对
The monetary policy tools available to the Federal Reserve are least likely to include:（）
A. open market operations.
B. the ability to determine the required reserve ratios of its member banks.
C. adjustments to the amount of gold held as reserves against Federal Reserve notes.
分析空气中苯浓度可采用（）的石英毛细柱。
A.5m～10m
B.10m～30m
C.20m～40m
D.30m～50m
