A 2-kg cart, traveling on a horizontal air track with a speed of 6 m/s, collides with a stationary 4-kg cart. The carts stick together. The impulse exerted by one cart on the other has a magnitude of: A: 0 B: 4 N · s C: 8 N · s D: 12 N · s E: 16 N · s

运行表单(cart)的命令是______。 A: DO cart B: DO cart.scx C: DO FORM cart D: RUN FORM cart

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}

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？（）

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>

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>

The waiter had brought the sweet cart. A: truck B: trolley C: van D: stroller

有关 CART 的细胞治疗,正确的是（ ） A: CART识别抗原需要 MHC限制性 B: CART仅能用逆转录病毒转染 C: CART不可以联合其他免疫治疗 D: CART设计包含了T细胞活化的第一信号和第二信号 E: CART主要用于实体瘤治疗

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a luggage cart