下面哪些句型，通常被用来引出研究问题？ A: While XYZ is well documented, it remains unclear whether/why... B: Despite a large body of evidence for XYZ, its detailed mechanisms remain to be elucidated. C: However, it remains to be investigated whether... D: ABC is the main mechanism used by all vertebrates to achieve XYZ.

\(已知二元函数f(x,y)=e^{xyz},则关于f的梯度为\nabla f=(\,)\) A: \[(yze^{xyz},xze^{xyz},xye^{xyz})\] B: \[(yze^{yz},xze^{xz},xye^{xy})\] C: \[(xyze^{xyz},xyze^{xyz},xyze^{xyz})\] D: \[(xe^{xyz},ye^{xyz},ze^{xyz})\]

若逻辑函数则（）。 A: XYZ=001 B: XYZ=110 C: XYZ=100 D: XYZ=011

a='ABC'b=aa='XYZ'print(a)print(b)，输出结果为？ A: XYZ ABC B: ABC XYZ C: ABC ABC D: XYZ XYZ

#print("Test")print("abc") #print("xyz")程序输出 A: Test<br/>abc xyz B: Test <br/>abc <br/>xyz C: abc D: abc xyz

有如下代码： const XYZ:int=100; XYZ=200; XYZ++; 则trace(XYZ)的结果为

数据段有语句“XYZ DWORD ?”,则XYZ的类型是______ ,用“TYPE XYZ”会得到数值为______ 。

xyz

在Windows中，下列合法的文件名是 __________ 。 A: XYZ\123：ZE B: XYZ/123.MP C: XYZ*123.EXE D: XYZ+123.DOC

\(已知u=e^{xyz},则\frac{\partial^3u}{\partial x\partial y\partial z}=(\,)\) A: \[(x^2y^2z^2+zyz+1)e^{xyz}\] B: \[(x^2yz^2+3zyz+1)e^{xyz}\] C: \[(x^2y^2z^2+3zyz+1)e^{xyz}\] D: \[(x^2y^2z^2+3zyz)e^{xyz}\]