正确答案: D
ⅠⅡⅢ
题目:骨折诊断标准()。Ⅰ.有外伤史Ⅱ.局部头痛Ⅲ.畸形变位Ⅳ.功能障碍
解析:D
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学习资料的答案和解析:
[单选题]A water jacket is placed around the exhaust manifolds of propulsion diesel enginesto( ).
reduce heat radiation to the engine room
解析:解析:water jacket:水套;exhaust manifold:排气总管;heat radiation:热辐射;condense and
drain moisture from exhaust gases:将水分从排气中冷凝析出;dampen exhaust gas pulsations in
the manifold:缓解排气总管中的废气脉动
[单选题]铰链式活塞冷却机构的主要缺点是________。
密封困难