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社会保障的定义及核心内容？
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卡车代表车型有哪些？
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男性最不愿意让别人告诉他，（）。
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橄榄桥脑小脑萎缩MRI特点为（）
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心肌抑顿正确的描述是（）。
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车间有关焊接质量的（）、（）进行存档，要求建立存档明细。
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引起溢流的原因很多，其中之一是地层流体的侵入，使钻井液密度（）。
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Please fill the blanks in the following question of instalment shipments to denote the similarities (3), 4), 7), 8)) and differences (1), 2), 5), 6)) between Example 1 and 2. Instalment shipments in Example 1 1st. 10,000 kgs latest on 30 April, 200× 2nd. 10,000 kgs latest on 31 May, 200× 3rd. 10,000 kgs latest on 30 June, 200× 1)The 2nd and 3rd shipments may be effected by the time of the ______ shipment. 2)The 3rd shipment may be effected by the time of the ______ shipment. 3)If the 1st shipment is not effected by 30 April, the credit would cease to be available for the ______ and the ______ shipments. 4)If the 1st shipment has been effected in time, and the 2nd shipment is not effected by 31 May, the credit would cease to be available for the ______ shipment. Instalment shipment in Example 2 4th, 10,000 kgs between 1 April, 200× to 30 April, 200× 5th, 10,000 kgs between 1 May, 200× to 31 May, 200× 6th, 10,000 kgs between 1 June, 200× to 30 June, 200 × 5)The 5th and 6th shipments may ______ be effected by the time of the 4th shipment. 6)The 6th shipment may ______ be effected by the time of the Sth shipment. 7)If the 4th shipment is not effected by 30 April, the credit would cease to be available for the ______ and the ______ shipments. 8)If the 4th shipment has been effected in time and the 5th shipment is not effected by 31 May, the credit would cease to be available for the ______ shipment.
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印花税应税凭证的保存期限，凡国家已有明确规定的，按规定办理；其他应税凭证应在履行纳税义务完毕后保存（）年。
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单位负反馈系统的开环传递函数为G（s）=K/（s（0.1s+1）（0.25s+1）），要保证闭环系统稳定，增益K的取值范围为（）。