法律、行政法规规定或者当事人约定采用书面形式订立合同，当事人未采用书面形式但一方已经履行主要义务，对方接受的，该合同成立。（）
参考答案：对
下面（）不是离心泵汽蚀的原因。
A、吸入压力降低
B、吸入高度过高
C、密封填料漏失量大
D、输送液体粘度增大
Jonathan Swift’s () is generally regarded as the best model of satire, not only of the period but also in the whole English literary history.
A. Gulliver’s Travels
B. The Battle of the Books
C. "A Modest Proposal"
D. A Tale of a Tub
