A golf cart moves with moderate speed as it reaches the base of a short but steep hill. The cart coasts up the hill (without using its brake or gas pedal). At the top of the hill the cart just about comes to rest; but then the cart starts to coast down the other side of the hill. Consider the forward motion of the cart to be positive. Which of the following velocity–time graphs best represents the motion of the cart?
未知类型：{'options': ['', '', '', ''], 'type': 102}
未知类型：{'options': ['', '', '', ''], 'type': 102}
举一反三
- Given that a scoped attribute cart exists only in a user’s session， which two， taken independently， ensure the scoped attribute cart no longer exists？（） A: ${cart = null} B: C: D: E: cart F: G: ${cart}
- Given that a scoped attribute cart exists only in a user’s session， which two，taken independently，ensurethe scoped attribute cart no longer exists？（） A: ${cart = null} B: <c：remove var="cart" /> C: <c：remove var="${cart}" /> D: <c：remove var="cart" scope="session" /> E: <c：remove scope="session">cart</c：remove>
- Given that a scoped attribute cart exist only in a user’s session， which two， taken independently， ensure the scoped attribute cart no longer exists？（） A: ${cart = null } B: <c：remove var=”cart” /> C: <c：remove var=”${cart}” /> D: <c：remove var=”cart” scope=”session” /> E: <c：remove scope=”session”>cart</c：remove> F: <c：remove var=”${cart}” scope=”session” /> G: <c：remove scope=”session”>${cart}</c：remove>
- 运行表单(cart)的命令是______。 A: DO cart B: DO cart.scx C: DO FORM cart D: RUN FORM cart
- 阅读下面代码： Book book = BookDB.getBook(id); HttpSession session = req.getSession(); List cart = (List) session.getAttribute("cart"); if (cart == null) { cart = new ArrayList(); session.setAttribute("cart", cart); } cart.add(book); 下面选项中，哪个是对上述代码功能的正确描述？（）