Given: String[] elements = { "for", "tea", "too" }; String first = (elements.length > 0) ? elements[0] : null; What is the result?()
A. Compilation fails.
B. An exception is thrown at runtime.
C. The variable first is set to null.
D. The variable first is set to elements[0].
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下述哪一种不属于肺源性呼吸困难()。
A. 支气管哮喘
B. 阻塞性肺气肿
C. 气管肿瘤
D. 大量胸腔积液
E. 重度贫血