[单选]
When a hydraulic vane pump is working, which of the following is in contact with the vanes?（）
(1) the rotor
(2) the internal surface of the housing
(3) the external surface of the housing

A . (1) only
B . (2) only
C . (1) and (2)
D . (1), (2) and (3)

被子植物水分和无机盐的运输（）仅依靠导管。仅依靠管胞。依靠导管以及管胞。依靠筛管。简述日本新鱼蚤病的症状合病理变化。 If the Charterer sends a vessel to an unsafe port，and she is damaged as a result，he will have to indemnify the（）. Receiver。 Cargo owner。 Shipowner。 Merchant。在PowerPoint 2003中，如果要给一张幻灯片中的标题加上某种动画效果，则应该在（）操作。幻灯片放映中的“自定义动画”。幻灯片放映中的“幻灯片切换”。幻灯片浏览中的“动画预览”。幻灯片浏览中的“常规任务&rdquo。在炸药内能使可燃物充分燃烧，而且不会产生氮氧化物为零氧平衡。

When a hydraulic vane pump is working, which of the following is in contact with the vanes?（）
(1) the rotor
(2) the internal surface of the housing
(3) the external surface of the housing

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[单选] When a hydraulic vane pump is working, which of the following is in contact with the vanes?（） (1) the rotor (2) the internal surface of the housing (3) the external surface of the housing

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[单选]
When a hydraulic vane pump is working, which of the following is in contact with the vanes?（）
(1) the rotor
(2) the internal surface of the housing
(3) the external surface of the housing