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薄壁细胞胞壁上纹孔均为单纹孔，而厚壁细胞胞壁上纹孔均为具缘纹孔。
A . 正确
B . 错误
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推荐知识点:
（）不属于信息系统项目的生命周期模型
张某出远门访亲，恰逢暴风雨，其承包的果园里的苹果都掉到地上，邻居李某将掉到地上的苹果捡起来并妥回保管，李某的行为是民事法律行为。（）
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.
自锁装置失效，将引起变速器跳档。
下列有关仲裁协议作用的表0述中，（）是不正确的。
高温高压井，由于井深，套管柱重量大，或是水泥段长，温差较大等原因，一般油层套管多采用（）固井。
Ⅱ型超敏反应又称为（）
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