【单选题】
新建一个流对象,下面哪个选项的代码是错误的?( )
①
new BufferedWriter(new FileWriter(a.txt));
②
new BufferedReader(new FileInputStream(a.dat));
③
new GZIPOutputStream(new FileOutputStream(a.zip));
④
new ObjectInputStream(new FileInputStream(a.dat));
【单选题】
下面四个轴向拉压杆件中( )项杆件的轴力图不正确。
①
<img src="20200804/1596524147297672.jpg" title="1596524147297672.jpg" alt="1596524101(1).jpg"/>
②
<img src="20200804/1596523813402361.jpg" title="1596523813402361.jpg" alt="C.jpg"/>
③
<img src="20200804/1596523797727884.jpg" title="1596523797727884.jpg" alt="A.jpg"/>
④
<img src="20200804/1596523827683153.jpg" title="1596523827683153.jpg" alt="D.jpg"/>