通报始终都贯穿着宣传教育的目的性，因此它在写作时一定要多发议论，多作分析，充分发挥说理的作用。
动作技能
充气安全阀充气后，必须在（）进行试验，稳压0.5min，不得泄漏。 ["水中；","柴油中；","乳化液中；","煤油中。"]
Ireland has a bipolar political party system with two major parties:（）. ["Sinn Fein and Fianna Fail ","Fianna Fail and Fine Gael","Sinn Fein and Fine Gael ","IRA and Sinn Fei"]
哪一种形式不属于流体机械能（） ["位能","压力能","动能","势能"]
简述艺术作品的层次
